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G. G. W0LPB.

HOT AIR PURNAGE.

No. 378,061. v Patented Feb. 14, 188,8;

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' ANITED STATES' PATENT GuRDoN e. VWOLEE, OE rrROY, NEw YORK, JAssIeNORr.ro THE FULLER a y WARREN COMPANY, OE SAME PLACE.

HOT-AIR FURNAOE.

SPECIFICATION forming part of Letters Patent No. 378.061, dated February14', 1888.

Application filed october 2s, was. serial No. 217,483. (No model.)

To aZZ whom, it may concern:

Be it known that I, GURDON G. WOLFE, of the city of Troy, county ofRensselaer, State of New York, have invented new and useful ImprovementsinfHotAir Furnaces, of which the following is a specification.

I My invention relates to improvements in hotair furnaces; and theseimprovements have for their object the better and more uniformdistribution to the radiating-dues of the heat evolved from the fire-potby an improved-construction of said ilues as to their comparative sizeand relative arrangement with reference to the exit-pipe, and theproduction by construction of a novel and efcient means to prevent thedust and ashes thrown out of the furnace from escaping into the roomwhile the grate is being cleared of ashes and clinker, and in theconstruction and novel arrangement of parts to produce adirect draftfrom the fire pot or cylinder to the exit.

As the radiating-dues of hotair furnaces are usually made, they areconstructed to all have the same transverse area as to size andcapacity, and as thus made those of them which furnish the most directpassage for the heated products of the fire to the exit-pipe carry off alarger part of the heat, while those most remote from the exit receiveand radiate to the passing air much less of the heat, which unequaldistribution Of the latter renders the action of the furnace irregular,it being a wellknown law that the heat generated by the fire in ahot-air furnace and under the draft in1- pulse Of a chimney will takethe most direct course to theeXit; and to remedy this difficulty by animproved means of construction and arrangement of the dues withreference to the latter is one of the purposes of my invention.

Accompanying this specification, to' form a part of it, there are threesheets of drawings, containing nine figures, illustrating my invention,with the same designation of parts byletler-reference used in alloffthem.

Of these illustrations, Figure l is a perspective ofthecombustion-chamber top, its dome, and upcast vertical fine parts,showing, also, as separated from the latter a ring-form top flue havinga connected cross-flue and depending vertical iiue parts that connectwith the vertical flue parts of the combustion-chamber, but in'thisillustration being shown as pulled apart from their connection, and withpart of the ring-form fine shown as broken out. Fig. 2 shows a centraltransversesectional view of the ring-form top lueand itsdiametricallyarranged cross-flue and exit. Fig. 3 is a central verticalsection of my improved furnace,taken from front torear, with one-half ofthe firegrate shown in side elevation. Fig. 4 is atop View of thevertical flue parts and dome, illustrating, also, a means for operatinga direct draft from the fire-pot to the top iue by means of a damperarranged in an opening in the `dome-top. Fig. 5 is a front elevation ofa guide-plate in which the dust-damper audits connections move. Fig. 6is a longitudinal vertical section taken through the dust.

damper, its link-plate, -latch-plate, and the latch on the door of theclinker-cleaning opening or passage, by which door as it is opened orclosed the dust-damper is operated. Fig. 7 is aperspective view of thedustdam per. Fig. 8 shows as detached the link-plate thatconnects thedust-damper with the latch-plate.

Fig. 9 is a top view of the dust-damper, its

connections, and thehnged door of the clinkercleaning passage.

The several parts of the hot-'air furnace thus illustrated, as well asthose containing my invention, are designated by reference-letters, andthe function of the vparts is described as follows:

The letter S designates the exterior shell of the furnace; A, theash-pit; G, the fire-grate;

P, the fire-pot or lire-cylinder, and C the comY y bustion-chamber.

The letter D indicates the dome formed in the top of thecombustiouchamber, and N the i IOO arranged diametrically with referenceto the ring-form flue, andat one of vits ends this crossilue connectsinteriorly with the latter and at its other end it is continued throughsaid ringform flue to produce the exit E by means of theinteriorly-placed vertical partition-plates 1' I, that are arranged toclose up the ring-form ilue thereat, and leaving an intervening areabetween said plate and within the ring R2, so as to make a continuationof the cross-flue M leading to the exit.

The letter gl designates a flue that is formed on and connects with thecross-tine M from the under side of the latter, and is made to extenddownwardly to connect with the top of the dome D by means of an opening,O2, made in the top of the dome.

The letter dZ designates a damper that is arranged in the flue g2, andthis damper is con structedwith a damper-rod, i", which passesexteriorly to the front. When this damper d is closed, the heatedproducts coming from the fire are caused to pass indirectly to the exitthrough the ring-form flue R to the crossflue M and to the exit; butwhen this damper is opened, then the heated gases from the fire passdirectly to` the cross-flue, and thence tothe exit.

The letter a designates a ilue part that is extended downwardly fromthat part of the flue-ring R2 which incloses the ring-form flue R wherethe continuation of the ue M is made in the ring R. At its upper endthis flue part a opens into the ilue M, and at its lower end it isadapted to connect with any of the flue parts that are upcast from thecombustionchamber. The flue parts p p2 p3, that are downcast from thehorizontal ring-form flue R, are arranged on the under side of thatdiametrical half of the latter which is opposite to that wherefrom thecontinuation of the flue M emerges to produce the exit E, but which isnearest to the connection made between the said ringform ilue and thecross-flue whereon the exit is formed, so that the heat passing throughsaid f flue partsppipBhas but a short distance to move before it reachesthe exit E. The transverse flue-area of each of these Iiue parts p' p p3is made smaller than the flue-areas of the line parts a2 aa,for thepurpose of reducing the area of luepassage of such of the yfine parts ashave the most direct and shortest passage to the exit, and making largercomparatively those flueareas from which the passing heat has thelongest and most indirect passage to the exit. The flue part a beingarranged in that part of the ring R2 which forms the continuation of thecross-flue M, and which at its upper end connects with the latter, ismade with a diaphragm-plate, mt, having the small flue-passage a. Thisdiaphragm-plate m, with the small flue-passage as, gives to the lflue Vaa smaller area than those lines which are farther from the line ofdirect draft, and operates to equalize and distribute the drafts in thedirection of the other dues. The combustion-chamber C is roofed in bythe dome D and the up Wafldlylprojected and linwardly-tapering flueparts'F F2 F3 F* F5 F. These flue parts connect at their upper ends withthe pendcntue parts formed on the ring R2, and indicated at p pi p and aa2 @wherever the said flue parts come vertically opposite. The upcastflue parts of the coinbustionchamber all have the same transverse areaat their upper ends, and each of them thereat is made with an annulargroove, g4, that is adapted to receive and make agas-tight joint withthe lower end of any one of the downcast flue parts of the ring-formiiue R. As' thus constructed and arranged the ring-form flue R has aseries of radial points at which its downcast flue parts may connectwith the upcast flue parts of the combustion-chamber, and so as to bringthe exit E at such a point as may be most convenientv for connectionwith the chimney; but at whatever point the ring-form fine may connectwith the combustion-chamber the contracted flue parts a', a, and a3 willbe in that diametri'cal half of said ring-forin flue that furnishes theshortest and most direct passage of the heat to the exit-line, and whichby their location and contracted area will compel a proper portion ofthe heat topass through the larger vertical flue parts which are in thatpart of the ring-form flue where the heat has the greatest distance tomove tothe exit,and thus to make the action of the furnace uniformthereby.

The letter J indicates a dust-flue connecting by means of an opening, O,in the bottom of and with the feed-passage N at its upper end, and atits lower end with the clinker-cleaning area P.

The letter d3 indicates a dust-damper constructed at the bottom of saidue and arranged to automatically open or close said dust-flue by meansof latch-connection made between said damper and the door of theclinker-cleaning passage. Vhen the clinkercleaning door is opened forthe purpose of cleaning the clinker from the grate, the door in openingdraws out the damper of the dustilue to open the latter, and so thatthere, is a draft-passage from the clinker-cleaning area directly to thefire-pot above the ire,and when the door K is closed then the damper dacloses up the bottom of the dust-flue.

The letter L designates a flat link plate which at its inner end, at n',is pivotally connected to the damper-plate d3 and at its outer endpivoted to the latch-plate L2 at n", and the letter Z2 indicates a lipformed on the under side and outer end of the latch-plate. The door K ofthe clinker-cleaning passage or area is constructed on its inner facewith a catch, cl, adapted to engage with the lip P of the latch-plate.

The dust-damper and its connection with the clinker-cleaning door areoperated as follows: When the door is closed, then the latch and catchconnect. When the door is opened,

IOO

the catch therein draws out thev damper until in its hinged movement ath, as turning, the door, after having drawn out the damper, disengagesthe latch. When the door is closed,

the catch on the'latter underruns the lip Fon the latch-plate, and bythe contact of the latter with the inner face of the door Kthe damper isforced to close.

The letter W indicates a guide-plate which is arranged across theclinker-cleani'ng pas sage P, and this plateis provided'with a guideway,wi, for the transverse passage of the dan1perplate and link-plate.A

Having thus described my invention, what I claim, aud desire to secureby LettersPatent,

1. In a hot-air furnace, the couibination of a combustiouchamberprovided with upcast vertical ue parts, a riugform horizontal flueformed `with downcast liue parts to connect withthe flue parts of thecombustionchamber and having a transversely-cross eXit-ue opening at oneend into the said ring-form ue and at the other end passing through saidringform Hue, and a flue part, a', projecting downward from the crossexit-Hue at its passage through the ring-forn1 flue to connect with anupcast iiue on the combustion'chamber, and provided with adiaphragmarrauged therein formed with an aperture, a, whereby the areaof the flue a' is made smaller than the respective areas of those flueswhich are farther from the line of direct draft, substantially asdescribed. I

2. The combinatiomin a hot-air furnace,of

fuel-supply passage at its upper end and at its lower end with theclinker-cleaning area of the y furnace, a damper arranged transverselyin said dust-Hue, a link-plate connected to said' damper, a latch-platemade with alatch at its outer end and at its inner end connected to`said link-plate, and a latch-catch arranged On 35`V a dust-flueconnecting with the bottom of the l

